Evidence-Based Medicine

An Introduction to EBM

Tools and Calculators

Bayesian Analysis Model (MEDCalc)
Calculates information (e.g. predictive value, likelihood ratio) about diagnostic tests.
Diagnostic Test Calculator (Alan Schwartz, University of Illinois at Chicago, Department of Medical Education)
A variety of calculator modes are presented that allow users to calculate disease prevalence, test sensitivity/specificity, or positive and negative Likelihood Ratios. 2 x 2 tables and a nomogram are available for use.
Likelihood Ratios (Centre for Evidence-Based Medicine)
NNT (Centre for Evidence-Based Medicine)
How to calculate number needed to treat.
Pre-Test Probability (Centre for Evidence-Based Medicine)
How to calculate pre-test probability.
Risk Reduction Calculator (Alan Schwartz, University of Illinois at Chicago, Department of Medical Education)
Calculate event rates and good/bad outcomes of new therapies.
SpPins and SnNouts (Centre for Evidence-Based Medicine)
Understanding sensitivity and specificity and other concepts related to SpPins and SnNouts.
Joanna Briggs Institute Evidence-Based Practice Database
ClinicalKey: Clinical Calculators
Search by keyword or browse by category.
DynaMed: Calculators
Includes decision trees, dosage calculators, medical equations and more.